Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fcc41e37e6b8bb…

MALICIOUS

PDF

92.4 KB Created: 2021-09-18 10:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b0cc2d7d00ceca220b8d7585ec56f8a SHA-1: 7566805cb1fe49f0fbb91a1bb810a9751e57dc1a SHA-256: 79fcc41e37e6b8bba9de4a970d66e9aaa0a65f5cd68aaa182e47119cc4edaa8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple unknown URLs, many hosted on compromised WordPress sites or disposable domains. The embedded JavaScript likely serves to redirect the user to these malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://yachtales.net/admin/userfiles/files/58141563420.pdf In PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalegefojabazixowunavilo.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/gexixomubawuradebifikim.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/fetazebetotu.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/98980561673.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/90421188576.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/wubudidumobezapes.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sezabetulafoganulexowon.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/gegopodipetisugimiturapim.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5e36ddf86e1d579251e1fe266228e0f1/208215757.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dovalojofemur.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613571db9c3c1---soluwatateluma.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/xaxuxadibewafagevakevemib.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/40675838119.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/55s0226ib0hd9vrt2chli01dhl/wusaguvot.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/maxakebesowejorawowamem.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/vimodosavewu.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/15647258714.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/radegewurarapikituvoxi.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/sadupizumotuko.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/76513772804.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/xuvadafofob.pdfIn PDF document text
    • https://andhimazhai.com/images/files/pifotisedesonisomogug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=zombieland+madison+actressPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 10636 bytes
SHA-256: 24972b5fc7a837f919399a373bf285a2ab5d6e0696a7fcca9d454c6d4ea012ff
font_01_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 18612 bytes
SHA-256: aee87edbee8ee7f35a4142a3081fa98d3a779be4ae409f4e8ce2affdba6905a1
font_02_sfnt_off00014be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1